Linear servo electric cylinder

Abstract

The utility model discloses a linear type servo electric cylinder which comprises a motor, a reduction gearbox, a lead screw, a guide rod and a lead screw nut, the motor is connected with an input shaft of the reduction gearbox, an output shaft of the reduction gearbox is connected with the lead screw, the guide rod and the lead screw are arranged on the same side of the reduction gearbox in parallel, and the lead screw nut is connected with the guide rod. Wherein the motor, the reduction gearbox and the guide rod are integrally formed; the lead screw nut is in threaded connection with the lead screw, a guide groove extending in the axial direction of the guide rod is formed in the lead screw nut, and the guide rod is slidably connected with the guide groove in a matched mode. According to the linear servo electric cylinder, the overall dimension of the whole electric cylinder is effectively reduced, the number of parts is reduced due to the integral forming design, the cost of raw materials is reduced, the production and manufacturing process is simplified, and the assembling procedure and the labor cost are reduced. And meanwhile, fewer parts mean fewer fault points, so that the later maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of industrial automation control equipment technology, specifically to a linear servo electric cylinder. Background Technology

[0002] Servo electric cylinders, as devices that convert the rotary motion of a motor into linear motion, are widely used in automated production lines, medical devices, aerospace, electronic equipment manufacturing, and many other fields, providing precise linear motion control for various equipment. As industrial equipment continues to develop towards miniaturization and integration, the requirements for the external dimensions of micro servo electric cylinders are becoming increasingly stringent. In related technologies, the large number of components in micro servo electric cylinders leads to a large footprint, resulting in issues of excessive size and high cost. Utility Model Content

[0003] This utility model aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of this utility model propose a linear servo electric cylinder.

[0005] The linear servo electric cylinder of this utility model embodiment includes a motor, a reduction gearbox, a lead screw, a guide rod, and a lead screw nut. The motor is connected to the input shaft of the reduction gearbox, and the output shaft of the reduction gearbox is connected to the lead screw to drive the lead screw to rotate. The guide rod is arranged parallel to the lead screw on the same side of the reduction gearbox, wherein the motor, the reduction gearbox, and the guide rod are integrally formed. The lead screw nut is threaded to the lead screw, and a guide groove extending along the axial direction of the guide rod is formed on the lead screw nut. The guide rod is slidably connected to the guide groove.

[0006] In some embodiments, the guide rods are multiple and are arranged at circumferential intervals along the lead screw.

[0007] In some embodiments, the lead screw nut has an opening on its sidewall that communicates with the guide groove.

[0008] In some embodiments, the linear servo electric cylinder of this utility model includes a brush and a sensor circuit board. One of the brush and the sensor circuit board is connected to the gearbox, and the other of the brush and the sensor circuit board is connected to the lead screw nut. The brush slides and conducts along the axial direction of the lead screw with the sensor circuit board, so that the sensor circuit board can determine the position information of the lead screw nut.

[0009] In some embodiments, a conductive carbon crystal powder layer is provided on one end face of the sensor circuit board adjacent to the brush.

[0010] In some embodiments, the brush is bent along the axial direction of the lead screw toward the sensor circuit board.

[0011] In some embodiments, the brush includes a straight segment, a bent segment, and an arc segment connected in sequence. The straight segment extends along the axial direction of the lead screw and is connected to the lead screw nut. The bent segment bends in the axial direction of the lead screw toward the sensor circuit board. The opening of the arc segment is disposed away from the sensor circuit board, and the bottom of the arc segment abuts against the sensor circuit board.

[0012] In some embodiments, the linear servo electric cylinder of this utility model includes a mounting plate with a connecting hole, a connecting post on the lead screw nut, the connecting post being connected to the connecting hole, and at least a portion of the linear segment being attached to the mounting plate.

[0013] In some embodiments, the guide rod is provided with a stop member located on the side of the lead screw nut that is axially away from the gearbox, and the stop member is used to stop the lead screw nut.

[0014] In some embodiments, the linear servo electric cylinder of this utility model further includes a cover plate, a base plate, a circuit board, and a fixing plate. The circuit board and the sensor circuit board are disposed on both sides of the fixing plate in its thickness direction. The circuit board and the sensor circuit board are signal connected. The fixing plate is connected to the base plate. The cover plate is detachably mounted on the base plate.

[0015] In some embodiments, the linear servo electric cylinder of this utility model further includes a motor base, which is detachably connected to the base plate.

[0016] In some embodiments, the gearbox includes a gearbox body, a fixed base, and a support plate. The motor is connected to the gearbox body. The fixed base is located on the side of the gearbox body away from the motor. The support plate is located on the side of the fixed base away from the gearbox body and extends along the axial direction of the lead screw. The guide rod is connected to one of the fixed base and the gearbox body. The fixed base has a first through hole through which the lead screw passes. The sensor circuit board is attached to the support plate.

[0017] In some embodiments, a groove is formed on one end face of the support plate adjacent to the brush, the groove extends along the axial direction of the lead screw, the sensor circuit board is attached to the bottom wall of the groove, and at least a portion of the brush is located in the groove.

[0018] In some embodiments, the lead screw nut includes a nut body and a mounting base, the mounting base having a channel extending axially along the lead screw for the support plate to pass through, and the brush disposed on the inner wall of the channel.

[0019] In some embodiments, a groove extending along the axial direction of the lead screw is provided on the inner wall of the channel, and a portion of the support plate is placed in the groove and slidably engages with the groove along the axial direction of the lead screw.

[0020] In some embodiments, the linear servo electric cylinder of this utility model further includes a motor base, which is connected to the motor.

[0021] The linear servo electric cylinder of this embodiment features an integrated design of the motor, gearbox, and guide rod, reducing the connection structures and installation space between components and effectively lowering the overall size of the cylinder. This allows the linear servo electric cylinder to better adapt to the trend of miniaturization and integration in industrial equipment, meeting the needs of use in space-constrained environments. The integrated design reduces the number of parts, lowering raw material costs and simplifying the manufacturing process, reducing assembly steps and labor costs. Simultaneously, fewer parts mean fewer potential failure points, lowering subsequent maintenance costs. The guide rod engages with the guide groove on the lead screw nut, providing precise guidance for the linear movement of the lead screw nut, effectively preventing deviations and wobbling during movement, thereby improving the cylinder's motion accuracy and stability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the linear servo electric cylinder structure according to an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram showing the connection of the motor, gearbox, and lead screw nut in an embodiment of this utility model.

[0024] Figure 3 This is a schematic diagram showing the connection of the motor, gearbox, guide rod, and lead screw according to an embodiment of this utility model.

[0025] Figure 4 This is a schematic diagram of the interaction between the brush and the sensor circuit board in an embodiment of this utility model.

[0026] Figure 5 This is a schematic diagram of the connection between the brush and the mounting plate in an embodiment of this utility model.

[0027] Figure 6 This is a structural schematic diagram of a linear servo electric cylinder according to another embodiment of the present invention.

[0028] Figure 7This is an exploded view of another embodiment of the linear servo electric cylinder of this utility model.

[0029] Figure 8 This is a schematic diagram of the structure of a lead screw nut according to another embodiment of the present invention.

[0030] Figure 9 This is a structural schematic diagram of a fixing base according to another embodiment of the present invention.

[0031] Figure label:

[0032] 100. Linear servo electric cylinder; 1. Motor; 2. Gearbox; 201. Gearbox body; 202. Fixing base; 2021. First through hole; 203. Support plate; 2031. Groove; 3. Lead screw; 4. Guide rod; 5. Lead screw nut; 501. Guide groove; 502. Opening; 503. Nut body; 504. Mounting base; 5041. Channel; 5042. Slide groove; 6. Brush; 601. Straight section; 602. Bending section; 603. Arc section; 7. Sensor circuit board; 8. Mounting plate; 801. Connecting hole; 9. Connecting post; 10. Stop; 11. Cover plate; 12. Base plate; 13. Circuit board; 14. Fixing plate; 15. Motor base. Detailed Implementation

[0033] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0034] like Figures 1 to 9 As shown, the linear servo electric cylinder 100 of this utility model embodiment includes a motor 1, a reduction gearbox 2, a lead screw 3, a guide rod 4, and a lead screw nut 5. The motor 1 is connected to the input shaft of the reduction gearbox 2, and the output shaft of the reduction gearbox 2 is connected to the lead screw 3 to drive the lead screw 3 to rotate. The guide rod 4 is arranged parallel to the lead screw 3 on the same side of the reduction gearbox 2, wherein the motor 1, the reduction gearbox 2, and the guide rod 4 are integrally formed. The lead screw nut 5 is threaded to the lead screw 3, and a guide groove 501 extending along the axial direction of the guide rod 4 is provided on the lead screw nut 5, and the guide rod 4 is slidably engaged with the guide groove 501.

[0035] In use, the linear servo electric cylinder 100 of this embodiment starts the motor 1 and outputs rotational power, which is transmitted to the input shaft of the connected reduction gearbox 2. The motor 1 can precisely control the speed, direction, and torque, providing a controllable power source for the entire system. The reduction gearbox 2 receives the power from the motor 1 and reduces the input speed through an internal transmission mechanism (such as gear transmission) while increasing the output torque. The output shaft of the reduction gearbox 2 transmits the adjusted power to the lead screw 3. The lead screw 3 begins to rotate under the drive of the output shaft of the reduction gearbox 2. Since the lead screw nut 5 is connected to the lead screw 3, the rotational movement of the lead screw 3 will cause the lead screw nut 5 to move linearly along the axial direction of the lead screw 3.

[0036] During the movement of the lead screw nut 5, the guide rod 4 plays a crucial role. The guide rod 4 is positioned parallel to the lead screw 3 on the same side of the reduction gearbox 2, and the lead screw nut 5 has a guide groove 501 extending axially along the guide rod 4. The guide rod 4 slidably engages with the guide groove 501. This design ensures the stability and accuracy of the lead screw nut 5 during linear motion, preventing it from deviating or wobbling.

[0037] The linear servo electric cylinder 100 of this utility model, due to the integrated design of the motor 1, reduction gearbox 2, and guide rod 4, reduces the connection structure and installation space between parts, effectively reducing the overall size of the electric cylinder. This allows the linear servo electric cylinder 100 to better adapt to the trend of industrial equipment towards miniaturization and integration, meeting the needs of use in space-constrained environments. The integrated design reduces the number of parts, lowering raw material costs and simplifying the manufacturing process, reducing assembly steps and labor costs. Simultaneously, fewer parts mean fewer potential failure points, reducing subsequent maintenance costs. The guide rod 4 cooperates with the guide groove 501 on the lead screw nut 5, providing precise guidance for the linear movement of the lead screw nut 5, effectively avoiding deviations and wobbling during movement, thereby improving the movement accuracy and stability of the electric cylinder.

[0038] In some embodiments, there are multiple guide rods 4, which are arranged at circumferential intervals along the lead screw 3.

[0039] like Figure 3 As shown, since multiple guide rods 4 are distributed at intervals along the circumference of the lead screw 3, a guide groove 501 is provided on the lead screw nut 5 corresponding to each guide rod 4. When the lead screw nut 5 moves linearly, the multiple guide rods 4 slide simultaneously in their respective guide grooves 501, jointly constraining and guiding the lead screw nut 5. This multi-directional guiding method can more effectively limit the rotation and offset of the lead screw nut 5, ensuring that it makes more stable and precise linear movements along the axial direction of the lead screw 3.

[0040] In some embodiments, the lead screw nut 5 has an opening 502 on its side wall that communicates with the guide groove 501.

[0041] For example, such as Figure 2 As shown, by providing an opening 502 on the side wall of the lead screw nut 5, the contact area between the inner wall of the guide groove 501 and the guide rod 4 can be reduced, thereby reducing wear and friction between the guide rod 4 and the guide groove 501, and thus extending the service life of the guiding system and the entire electric cylinder. In addition, the overall size of the lead screw nut 5 can be further reduced.

[0042] In some embodiments, the linear servo electric cylinder 100 of this utility model includes a brush 6 and a sensor circuit board 7. One of the brush 6 and the sensor circuit board 7 is connected to the reduction gearbox 2, and the other of the brush 6 and the sensor circuit board 7 is connected to the lead screw nut 5. The brush 6 slides and conducts along the axial direction of the lead screw 3 with the sensor circuit board 7, so that the sensor circuit board 7 can determine the position information of the lead screw nut 5.

[0043] For example, brush 6 is connected to lead screw nut 5, and sensor circuit board 7 is connected to gearbox 2. Since gearbox 2 is relatively fixed in position (as a component for power transmission and support), while lead screw nut 5 will move linearly along the axial direction as lead screw 3 rotates, relative linear sliding will occur between brush 6 and sensor circuit board 7.

[0044] The brush 6 slides along the axial direction of the lead screw 3 and remains conductive with the sensor circuit board 7. The sensor circuit board 7 typically contains a specific circuit structure and signal processing system. When the lead screw nut 5 moves, it drives the connected components (brush 6 or sensor circuit board 7) to move. The brush 6 slides on the sensor circuit board 7, changing the contact position between the brush 6 and the circuit on the sensor circuit board 7, thereby causing changes in the electrical signals (such as resistance, voltage, and other parameters) in the circuit. By detecting and analyzing these changes in electrical signals, and based on pre-set algorithms and calibration parameters, the sensor circuit board 7 can accurately determine the specific position of the lead screw nut 5 along the axial direction of the lead screw 3.

[0045] For many applications requiring precise linear motion control, knowing the real-time position of the lead screw nut 5 is crucial. Through the cooperation of the brush 6 and the sensor circuit board 7, the position information of the lead screw nut 5 can be obtained in real time and with precision. This allows the control system to precisely adjust the motor 1 based on this position information, thereby achieving precise control of the linear motion position of the electric cylinder. This absolute position feedback method ensures control accuracy within ±0.02mm. For example, in precision positioning processes on automated production lines and in the precise operation of medical devices, this precise position control can improve product quality and work efficiency.

[0046] Position information can be input as a feedback signal into the entire electric cylinder control system. When a deviation is detected between the actual position of the lead screw nut 5 and the set position, the control system can promptly adjust the operating parameters of the motor 1 (such as speed and direction) to enable the lead screw nut 5 to quickly and accurately reach the set position, forming a closed-loop feedback adjustment system that enhances the stability and reliability of the electric cylinder's movement.

[0047] In some embodiments, a conductive carbon crystal powder layer is provided on one end face of the sensor circuit board 7 adjacent to the brush 6.

[0048] The conductive carbon crystal powder layer has excellent conductivity, which can reduce the contact resistance between the brush 6 and the sensor circuit board 7, and reduce signal fluctuations and interference caused by poor contact. The stable conductivity ensures that the electrical signal received by the sensor circuit board 7 is accurate and reliable, making position detection more precise and improving the stability and accuracy of the entire electric cylinder position control system. The usage frequency of the sensor circuit board 7 has increased from 10,000 times in the industry to 3 million times.

[0049] The carbon crystal powder layer is relatively soft and has a certain degree of lubricity. During the sliding process between the brush 6 and the sensor circuit board 7, it can act as a buffer and lubricant, reducing direct friction and wear between the surfaces of the brush 6 and the sensor circuit board 7. This not only extends the service life of the brush 6 and the sensor circuit board 7, but also ensures the stability of the position detection function during long-term use.

[0050] The excellent conductivity and uniform surface properties of the conductive carbon crystal powder layer enable it to effectively resist the influence of external electromagnetic interference and other factors on electrical signals. In complex industrial environments, electromagnetic interference may affect the accurate judgment of position signals by the sensor circuit board 7, while the conductive carbon crystal powder layer can provide a relatively stable environment for the transmission of electrical signals, thereby improving the anti-interference capability of the position detection system.

[0051] In some embodiments, the brush 6 is bent along the axial direction of the lead screw 3 toward the sensor circuit board 7.

[0052] like Figure 5 As shown, the bent brush 6 design increases the contact pressure and contact area between the brush 6 and the sensor circuit board 7. During the operation of the electric cylinder, even with some vibration or impact, the bent brush 6 can better maintain tight contact with the sensor circuit board 7, avoiding signal interruption or fluctuations caused by poor contact, and greatly improving the stability and reliability of position detection. Stable contact ensures that the electrical signal received by the sensor circuit board 7 accurately reflects the actual position of the brush 6, reducing signal errors. This allows the control system to more accurately determine the position of the lead screw nut 5, meeting the needs of applications with high motion accuracy requirements, such as precision machining and high-precision assembly.

[0053] In some embodiments, the brush 6 includes a straight segment 601, a bent segment 602, and an arc segment 603 connected in sequence. The straight segment 601 extends along the axial direction of the lead screw 3 and is connected to the lead screw nut 5. The bent segment 602 bends in the axial direction of the lead screw 3 toward the sensor circuit board 7. The opening 502 of the arc segment 603 is disposed away from the sensor circuit board 7, and the bottom of the arc segment 603 abuts against the sensor circuit board 7.

[0054] like Figure 5 As shown, the design of the arc segment 603 makes the contact between the brush 6 and the sensor circuit board 7 more stable and reliable. Compared with the ordinary straight brush 6, the arc structure can adapt to the slight unevenness or fluctuations on the surface of the sensor circuit board 7, and always maintain a tight fit with the sensor circuit board 7 during the sliding process, which greatly reduces the poor contact caused by external factors such as vibration and impact, and ensures the stable transmission of position detection signals.

[0055] When the bottom of the arc-shaped segment 603 slides on the sensor circuit board 7, the contact area is relatively large and the force is more evenly distributed. This effectively disperses the frictional force and reduces the wear on the surfaces of the brush 6 and the sensor circuit board 7. The reduction in wear not only extends the service life of the brush 6 and the sensor circuit board 7, but also ensures the accuracy and stability of position detection during long-term use.

[0056] In some embodiments, the linear servo electric cylinder 100 of this utility model includes a mounting plate 8, a connecting hole 801 is provided on the mounting plate 8, a connecting post 9 is provided on the lead screw nut 5, the connecting post 9 is connected to the connecting hole 801, and at least a portion of the linear segment 601 is attached to the mounting plate 8.

[0057] As shown in Figure 5, the mounting plate 8 is connected to the connecting post 9 on the lead screw nut 5 through the connecting hole 801. This connection method firmly binds the mounting plate 8 and the lead screw nut 5 together. When the lead screw 3 rotates under the drive of the reduction gearbox 2, causing the lead screw nut 5 to move linearly along the axial direction, the mounting plate 8 will move synchronously with the lead screw nut 5.

[0058] At least a portion of the straight section 601 of the brush 6 is attached to the mounting plate 8. Since the mounting plate 8 moves synchronously with the lead screw nut 5, the brush 6 also moves along with the mounting plate 8. In this way, during the linear movement of the lead screw nut 5, the brush 6 can slide stably on the sensor circuit board 7, ensuring the relative motion relationship between the brush 6 and the sensor circuit board 7. This allows the sensor circuit board 7 to continuously and accurately detect changes in the position of the brush 6, thereby determining the position information of the lead screw nut 5.

[0059] Mounting plate 8, acting as an intermediate connecting component, connects the lead screw nut 5 and brush 6 tightly through the connection hole 801 and the connecting post 9, forming a relatively stable overall structure. This stable structure helps reduce the shaking and displacement between components during operation, improving the overall operational stability of the electric cylinder. Especially under high-speed operation or heavy load conditions, it can effectively prevent malfunctions caused by loose components.

[0060] In some embodiments, the guide rod 4 is provided with a stop 10, which is located on the side of the lead screw nut 5 that is axially away from the gearbox 2, and the stop 10 is used to stop the lead screw nut 5.

[0061] like Figure 6 As shown, when the electric cylinder is working normally, the lead screw nut 5 moves linearly along the guide rod 4 under the drive of the lead screw 3. The stop 10 does not affect its movement within its normal stroke range, and the lead screw nut 5 can move freely back and forth within a specified distance. When the lead screw nut 5 moves to its limit position away from the reduction gearbox 2, it will contact the stop 10. The stop 10 will prevent the lead screw nut 5 from continuing to move in that direction, thereby limiting the maximum stroke of the lead screw nut 5 and preventing it from deviating from its normal working range.

[0062] In some embodiments, the linear servo electric cylinder 100 of this utility model further includes a cover plate 11, a base plate 12, a circuit board 13, and a fixing plate 14. The circuit board 13 and the sensor circuit board 7 are disposed on both sides of the fixing plate 14 in the thickness direction. The circuit board 13 is connected to the sensor circuit board 7 for signal transmission. The fixing plate 14 is connected to the base plate 12. The cover plate 11 is detachably mounted on the base plate 12.

[0063] For example, the sensor circuit board 7 is bonded to the fixing plate 14 with 3M adhesive, and the cover plate 11 and the fixing plate 14 are connected to the base plate 12 with screws.

[0064] During the operation of the linear servo electric cylinder 100, the brush 6 moves with the lead screw nut 5 and slides on the sensor circuit board 7. The sensor circuit board 7 determines the position information of the lead screw nut 5 by detecting the electrical signal generated by the change in the position of the brush 6. The sensor circuit board 7 transmits the acquired position signal to the circuit board 13 connected to it.

[0065] After receiving the position signal from the sensor circuit board 7, the circuit board 13 processes and analyzes the signal. According to the preset program and control logic, it can convert the processed signal into control commands and feed them back to the control system of the motor 1, thereby achieving precise control of the motor 1 and adjusting the movement state of the lead screw nut 5 to accurately reach the set position.

[0066] The mounting plate 14 provides mounting support for the circuit board 13 and the sensor circuit board 7, fixing them to both sides in the thickness direction, ensuring the stability of their relative positions and facilitating reliable signal transmission. The base plate 12 is connected to the mounting plate 14, serving to support and fix the entire control unit. The cover plate 11 is detachably mounted on the base plate 12, providing a relatively enclosed protective space for electronic components such as the circuit board 13 and the sensor circuit board 7, preventing damage from external dust, moisture, impurities, etc., and ensuring the normal operation of the entire position detection and control system.

[0067] Optionally, such as Figure 1 As shown, the linear servo electric cylinder 100 of this embodiment also includes a motor base 15, which is detachably connected to the base plate 12. For example, the motor base 15 is bonded to the base plate 12 with adhesive.

[0068] In other embodiments, the gearbox 2 includes a gearbox body 201, a fixed base 202, and a support plate 203. The motor 1 is connected to the gearbox body 201, and the fixed base 202 is located on the side of the gearbox body 201 away from the motor 1. The support plate 203 is located on the side of the fixed base 202 away from the gearbox body 201 and extends along the axial direction of the lead screw 3. The guide rod 4 is connected to either the fixed base 202 or the gearbox body 201. The fixed base 202 has a first through hole 2021 through which the lead screw 3 passes. The sensor circuit board 7 is connected to the fixed base 202.

[0069] For example, such as Figure 9 As shown, the guide rod 4, the fixing seat 202, and the support plate 203 are integrally formed. Of course, in some other embodiments, the fixing seat 202 may also have a second through hole for the guide rod 4 to pass through, and the guide rod 4 is threadedly connected to the box body 201.

[0070] like Figure 6 As shown, motor 1 is connected to the gearbox 2's housing 201, transmitting power to the transmission mechanism (such as gears) within the housing 201. The function of gearbox 2 is to adjust the speed of motor 1, reducing the speed and increasing the torque to meet the rotational requirements of lead screw 3.

[0071] The mounting base 202 is located on the side of the housing body 201 away from the motor 1, serving as a connection and support. It organically integrates the gearbox 2 with subsequent components such as the guide rod 4, lead screw 3, and support plate 203, making the entire linear servo electric cylinder 100 more compact and stable.

[0072] The guide rod 4 is connected to the fixed base 202 and is arranged parallel to the lead screw 3. When the reduction gearbox 2 drives the lead screw 3 to rotate, the lead screw nut 5 will move linearly along the lead screw 3. The guide rod 4 provides guidance for the movement of the lead screw nut 5, ensuring the stability and accuracy of its linear movement.

[0073] The fixed base 202 has a first through hole 2021 for the lead screw 3 to pass through, ensuring that the lead screw 3 can smoothly pass through the fixed base 202 and connect to the output shaft of the reduction gearbox 2 to achieve rotation. The sensor circuit board 7 is connected to the fixed base 202. The brush 6 moves with the lead screw nut 5 and slides on the sensor circuit board 7. The sensor circuit board 7 determines the position information of the lead screw nut 5 by detecting the electrical signal generated by the position change of the brush 6, thereby providing feedback for the precise control of the electric cylinder.

[0074] The design of the gearbox 2's housing 201 and mounting base 202 allows the motor 1, gearbox 2, and subsequent components such as the guide rod 4, sensor circuit board 7, and support plate 203 to be tightly integrated into a highly integrated whole. This compact structure reduces the overall size of the electric cylinder, making it more suitable for use in space-constrained industrial environments, and conforms to the development trend of miniaturization and integration of industrial equipment.

[0075] The mounting bracket 202, as a key component for connection and support, enhances the stability of the entire electric cylinder structure. It firmly connects the various components together, reducing vibration and shaking during operation, lowering the probability of failures caused by loose or displaced components, and improving the reliability of electric cylinder operation.

[0076] The sensor circuit board 7 is connected to the fixed base 202 via the support plate 203, enabling stable detection of the position information of the lead screw nut 5. The fixed base 202 provides a stable mounting position for the sensor circuit board 7, reducing the impact of vibration and other factors on the detection accuracy of the sensor circuit board 7, thereby ensuring the accuracy of the electric cylinder position control.

[0077] In some embodiments, a groove 2031 is provided on one end face of the support plate 203 adjacent to the brush 6. The groove 2031 extends along the axial direction of the lead screw 3. The sensor circuit board 7 is attached to the bottom wall of the groove 2031. At least a portion of the brush 6 is located in the groove 2031.

[0078] like Figure 9 The groove 2031 provides an installation position for the sensor circuit board 7, thereby limiting the movement of the sensor circuit board 7. Since at least a portion of the brush 6 is located within the groove 2031, the groove 2031 also limits the movement of the brush 6, which helps to improve the operational reliability of the brush 6 and the sensor circuit board 7.

[0079] In some embodiments, the lead screw nut 5 includes a nut body 503 and a mounting base 504. The mounting base 504 has a channel 5041 extending axially along the lead screw 3, through which the support plate 203 passes. The brush 6 is disposed on the inner wall of the channel 5041.

[0080] like Figures 6 to 8 As shown, the lead screw nut 5 consists of a nut body 503 and a mounting base 504. The mounting base 504 has a channel 5041 extending along the axial direction of the lead screw 3. The support plate 203 passes through this channel 5041, and the brush 6 is disposed on the inner wall of the channel 5041. When the lead screw nut 5 rotates with the lead screw 3 and moves linearly, the mounting base 504 moves along with it, and the brush 6 on the inner wall of the channel 5041 slides on the sensor circuit board 7. Since the brush 6 and the sensor circuit board 7 remain in a conductive state, the sensor circuit board 7 can accurately determine the specific position of the lead screw nut 5 in the axial direction of the lead screw 3 by detecting the change in electrical signal (such as changes in parameters such as resistance and voltage) caused by the change in the position of the brush 6.

[0081] This structure cleverly integrates position detection functionality with the lead screw nut 5. By providing a channel 5041 on the mounting base 504 for the support plate 203 to pass through, and arranging the brush 6 on the inner wall of the channel 5041, additional complex external connection structures are avoided, making the entire electric cylinder structure more compact. It achieves the integration of motion and position detection functions within a limited space, adapting to the development needs of miniaturization and integration in industrial equipment.

[0082] The brush 6 is directly mounted on the inner wall of channel 5041 and contacts the sensor circuit board 7 mounted on the support plate 203. This tight contact ensures a stable electrical connection between the brush 6 and the sensor circuit board 7. During the movement of the lead screw nut 5, it effectively reduces contact problems caused by vibration, shaking, and other factors, thereby improving the stability and reliability of position detection. Even under complex working conditions, it can accurately obtain the position information of the lead screw nut 5, providing strong support for the precise control of the electric cylinder.

[0083] In some embodiments, a groove 5042 extending along the axial direction of the lead screw 3 is provided on the inner wall of the channel 5041, and a portion of the support plate 203 is placed in the groove 5042 and slidably engages with the groove 5042 along the axial direction of the lead screw 3.

[0084] A portion of the support plate 203 is located within the slide groove 5042. When the mounting base 504 moves with the lead screw nut 5, the support plate 203 and the slide groove 5042 slide relative to each other. Simultaneously, the brush 6, mounted on the inner wall of the channel 5041, slides on the surface of the sensor circuit board 7. Since the sensor circuit board 7 and the brush 6 remain conductive, the sensor circuit board 7 determines the position information of the lead screw nut 5 by detecting changes in the electrical signal caused by changes in the position of the brush 6. The slide groove 5042 provides precise guidance for the sliding of the support plate 203, limiting the displacement and wobbling of the sensor circuit board 7 in other directions. This allows the brush 6 to slide more stably and accurately on the sensor circuit board 7, reducing position detection errors caused by positional deviations of the sensor circuit board 7, thereby significantly improving the accuracy of the electric cylinder's position detection of the lead screw nut 5 and meeting the requirements of applications with high motion accuracy.

[0085] Optionally, the linear servo electric cylinder 100 of this embodiment of the present invention further includes a motor base 15, which is connected to the motor 1. For example, the motor base 15 is welded to the motor 1.

[0086] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0087] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0088] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0089] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0090] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0091] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A linear servo electric cylinder, characterized in that, include: The motor (1), gearbox (2), lead screw (3), and guide rod (4) are provided. The motor (1) is connected to the input shaft of the gearbox (2), and the output shaft of the gearbox (2) is connected to the lead screw (3) to drive the lead screw (3) to rotate. The guide rod (4) is arranged parallel to the lead screw (3) on the same side of the gearbox (2). The motor (1), the gearbox (2), and the guide rod (4) are integrally formed. A lead screw nut (5) is connected to the lead screw (3) for transmission. The lead screw nut (5) has a guide groove (501) extending axially along the guide rod (4). The guide rod (4) is slidably connected to the guide groove (501).

2. The linear servo electric cylinder according to claim 1, characterized in that, The guide rod (4) is a plurality of such guide rods, which are arranged at circumferential intervals along the lead screw (3).

3. The linear servo electric cylinder according to claim 1, characterized in that, The lead screw nut (5) has an opening (502) on its side wall that communicates with the guide groove (501).

4. The linear servo electric cylinder according to claim 1, characterized in that, The device includes a brush (6) and a sensor circuit board (7). One of the brush (6) and the sensor circuit board (7) is connected to the gearbox (2), and the other of the brush (6) and the sensor circuit board (7) is connected to the lead screw nut (5). The brush (6) slides and conducts along the axial direction of the lead screw (3) with the sensor circuit board (7) so that the sensor circuit board (7) can determine the position information of the lead screw nut (5).

5. The linear servo electric cylinder according to claim 4, characterized in that, A conductive carbon crystal powder layer is provided on one end face of the sensor circuit board (7) adjacent to the brush (6).

6. The linear servo electric cylinder according to claim 4, characterized in that, The brush (6) is bent along the axial direction of the lead screw (3) toward the sensor circuit board (7).

7. The linear servo electric cylinder according to claim 6, characterized in that, The brush (6) includes a straight segment (601), a bent segment (602) and an arc segment (603) connected in sequence. The straight segment (601) extends along the axial direction of the lead screw (3) and is connected to the lead screw nut (5). The bent segment (602) bends in the axial direction of the lead screw (3) toward the sensor circuit board (7). The opening (502) of the arc segment (603) is set away from the sensor circuit board (7), and the bottom of the arc segment (603) abuts against the sensor circuit board (7).

8. The linear servo electric cylinder according to claim 7, characterized in that, The device includes a mounting plate (8) with a connecting hole (801) and a connecting post (9) on the lead screw nut (5). The connecting post (9) is connected to the connecting hole (801), and at least a portion of the straight segment (601) is attached to the mounting plate (8).

9. The linear servo electric cylinder according to claim 1, characterized in that, The guide rod (4) is provided with a stop (10), which is located on the side of the lead screw nut (5) away from the gearbox (2) in its axial direction. The stop (10) is used to stop the lead screw nut (5).

10. The linear servo electric cylinder according to claim 4, characterized in that, It also includes a cover plate (11), a base plate (12), a circuit board (13), and a fixing plate (14). The circuit board (13) and the sensor circuit board (7) are disposed on both sides of the fixing plate (14) in the thickness direction. The circuit board (13) is connected to the sensor circuit board (7) for signal transmission. The fixing plate (14) is connected to the base plate (12). The cover plate (11) is detachably mounted on the base plate (12).

11. The linear servo electric cylinder according to claim 10, characterized in that, It also includes a motor base (15), which is detachably connected to the base plate (12).

12. The linear servo electric cylinder according to claim 4, characterized in that, The gearbox (2) includes a gearbox body (201), a fixed seat (202), and a support plate (203). The motor (1) is connected to the gearbox body (201). The fixed seat (202) is located on the side of the gearbox body (201) away from the motor (1). The support plate (203) is located on the side of the fixed seat (202) away from the gearbox body and extends along the axial direction of the lead screw (3). The guide rod (4) is connected to one of the fixed seat (202) and the gearbox body (201). The fixed seat (202) has a first through hole (2021) through which the lead screw (3) passes. The sensor circuit board (7) is attached to the support plate (203).

13. The linear servo electric cylinder according to claim 12, characterized in that, The support plate (203) has a groove (2031) on one end face adjacent to the brush (6). The groove (2031) extends along the axial direction of the lead screw (3). The sensor circuit board (7) is attached to the bottom wall of the groove (2031). At least a portion of the brush (6) is located in the groove (2031).

14. The linear servo electric cylinder according to claim 13, characterized in that, The lead screw nut (5) includes a nut body (503) and a mounting base (504). The mounting base (504) has a channel (5041) extending axially along the lead screw (3). The channel (5041) allows the support plate (203) to pass through. The brush (6) is disposed on the inner wall of the channel (5041).

15. The linear servo electric cylinder according to claim 14, characterized in that, The inner wall of the channel (5041) is provided with a groove (5042) extending along the axial direction of the lead screw (3). A portion of the support plate (203) is placed in the groove (5042) and slidably engages with the groove (5042) along the axial direction of the lead screw (3).

16. The linear servo electric cylinder according to claim 12, characterized in that, It also includes a motor base (15) which is connected to the motor (1).

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